Uhm, what's your price range haha. If you want to avoid a receiver you will have to go with a power amp and have your sound card be the pre-amp/processor.

Could you also let me know what speakers and sound card you are using.

You can always hunt audiogon, kijiji, etc for a used power amp but you probably won't find anything for a better price than a new Emotiva UPA-5 (currently on sale). I have their UPA-7 and UMC-1 which are amazing.